package com.lara1;

import java.util.HashSet;

public class Manager14 {
public static void main(String[] args) {
	HashSet s=new HashSet<>();
	System.out.println(s.add(90));
	System.out.println(s.add(90));
	System.out.println(s.add(90));
	System.out.println(s.add(90));
	System.out.println(s.size());
}
}
